The KH3935 from Beijing KeHuan Century EMC Technology is a EMI Receiver with Attenuation 35 to 40 dB, Frequency 9 kHz to 30 MHz, Measurement Range 0 to 120 dBuV, Resolution 30 Hz to 1 kHz, Supply Voltage 220 VAC. More details for KH3935 can be seen below.